Eugenic bazzi and aurelio bianchi



(No Index. r

A E. BAZZI & A. BIANGHI.

APPARATUS'FOR RENDBRING SMALL SOUNDS AUDIBLB. No. 575,320. Patented Jan. 19, 1897.

NOTO-LITNO., wnsmmsrow n c UNITED STATES PATENT OFFICE.

EUGENIO BAZZI AND AURELIO BIANCHI, OF FLORENCE, ITALY, ASSIGNORS TO MARTIN WVALLAOH NAOI-IFOLGER, OF CASSEL, GERMANY.

APPARATUS FOR RENDERING SMALL SOUNDS AUDIBLE.

SPECIFICATION forming part of Letters Patent No. 575,320, dated January 19, 1897.

Application filed September 22, 1896. Serial No. 606,647. (No model.) Patented in Italy March 19, 1895, No. 38,426 in Germany May 22,1895,No. 85,784; in France May 27,1896,N0. 247,712; in England May 29, 1895,No. 10,223, and

in Hungary June 22,1895,N0.3,648.

T at whmn it may concur/t:-

Be it known that we, EUGENIO BAZZI and AURELIO BIANOHI, subjects of the King of Italy, residing at Florence, Italy, have invented new and useful Improvements in an Apparatus for Rendering Small Sounds DistinctlyAudible on a Magnified Scale, of which the following is a specification.

Ourinvention relates to an apparatus which [0 we call a phonendoscope and which renders small sounds in the human body, or in all bodies in general, distinctly audible on a magnified scale.

This invention has been patented to us in Italy, No. 38,426, dated March 19, 1895; in France, No. 247,712, dated May 27, 1895; in Hungary, No. 3,648, dated June 22, 1895, and to our assigns, Martin Vallach, successor, in Germany, No. 85,784, dated May 22, 1895, and

in Great Britain, No.10,223, dated May 29, 1895.

The improved apparatus is based essentially upon the fact that an elastic membrane or other body capable of vibrating is united 2 5 to a body of a larger mass and consequently greater inertia. When such a body is laid upon another body in which small noises, rustlings, or murmurs occur, the membrane is set in vibratory motion in relation to the heavy solid body, while the large mass of the latter itself partakes not at all or very slightly and imperceptibly in that vibration.

The vibrations or oscillations of the membrane are made audible in any appropriate 3 5 manner; 6. g., by means of a microphone or by propagation of the air vibrations created thereby.

In the accompanying drawings, Figure 1 is a view of the back of the apparatus. Fig. 2

40 is a central sectional view; and Fig. 3 is a side view, the hearing-tubes being broken away in Figs. 2 and 3.

The apparatus consists of a relatively inert disk or body S of heavy metal or other like 5 material of considerable weight, for instance, like wood weighted with lead and the like. In the center of the disk is provided a hollow or cavity 6, covered by a membrane m, of hard rubber or similar material, constituting a diaphragm. Inside this hollow space a weak spring 9 may be provided, so as to press upon the membrane or diaphragm. This membrane is packed tightly and securely against the edge of the disk by a clampingring r. Over this membrane is a somewhat thicker hard-rubber plate 19, incased in orbordered by a ring and secured on the clampingring r by a bayonet-lock fastening or any simi lar means.

It will be found advantageous to provide this rubber plate with a central orifice, wherein may be secured a hard-rubber or metal rod 72.. This rod, when not in use, may be fastened on the rear side of the box by bands or staples n and secured in place byasmall nut 6 5 r, as shown in Figs. 1 and 3.

On the rear side of the disk or box S are bored two holes terminating in the central hollow. Two hearing trumpets or pipes in may be inserted in thtse holes, which tubes, whenever the apparatus is not in use, may be wound around the edge of the box, grooveshaped for the purpose, and there retained by a hookt or other suitable device.

If this phonendoscope be brought into con- 7 5 tact with any solid body, either by the knob on the end of the rod or by the freely-em posed hard-rubber plate 19, the tone-vibrations in that solid body will communicate themselves to the point of contact With the knob of the diaphragm,while the disk or body S,which is relatively inert, will remain practically motionless. Consequently the movements of the plate will show themselves in comparison with those of the box as enormously greater. These movements therefore generate strong changes of volume in the hollow space 6 and give rise to strong vibrations, which are communicated to the sense of hearing bymeans of the hearing-trumpets 76.

The transmission of the vibrations of the diaphragm may also be effected with the aid of a microphone, and the disk or body S may be rectangular or of any other form.

Having thus fully set forth our invention, 9 5 what we claim as new, and desire to secure by Letters Patent, is-

1. An apparatus for rendering small sounds audible on a magnified scale comprising a relatively inert and heavy disk or body, such as S, a light diaphragm m attached at its periphery to the edge of said disk, and means for transmitting the vibrations of the diaphrag'm, substantially as and for the purpose specified.

2. In an apparatus for rendering small sounds audible the combination with a relatively inert heavy disk or body, such as S, of a membrane attached at its periphery to said disk, a hollow space between said disk and membrane, a spring interposed between said disk and membrane, and means for transmitting the Vibrations of a diaphragm, substantially as described.

3. In an apparatus for rendering small sounds audible the combination with a heavy disk or body, and a membrane, such as m, of a plate, such as 12, secured over the membrane substantially as described A. In an apparatus for rendering small sounds audible the combination witha heavy In testimony whereof We have signed our names to this specification in the presence of two subscribing witnesses.

EUGENIO IBAZZI. AURELIO LBIANCIII.

\Vitnesses as to the signature of Eugenio Bazzi:

Fnnno GALLI, GUIDo EURCI-IINO. \Vitncsses as to the signature of Aurelio lit anchi:

EDWARD P. llllxloLn xN, DAVID T. S. FULLER.

It is hereby certified that in Letters Patent No, 575,320, granted January 19, 1897, upon the application of Eugenio Bazzi and Aurelio Bianchi, of Florence, Italy, for an improvement in Apparatus for, Rendering Small Sounds Audible, errors appear in the printed specification requiring correction as follows: In line 15, page 2, the article a should read the, and line 21, same page, a comma should be inserted and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Oflice. I

Signed, counter-signed, and sealed this 26th day of January, A. D., 1897.

[SEAL] JNO. M. REYNOLDS,

Assistant Secretary of the Interior.

before the word substantially,

Countersigned JOHN S. SEYMOUR,

Commissioner of Patents.

c Corrections in Letters Patent No. 575,32 1x It is hereby certified that in Letters Patent No, 575,320, granted January 19, 1897,

upon the application of Eugenio Bazzi and Aurelio Bianchi, of Florence, Italy, for an improvement in Apparatus for, Rendering Small Sounds Audible, errors appear in the printed specification requiring correction as follows: In line 15, page 2, the article a should read the, and line 21, same page, a comma should be inserted before the word substantially; and that the said Letters Patent should be read With these corrections therein that the same may conform to the record of the case in the Patent Ofiice.

Signed, counter-signed, and sealed this 26th day of January, A. D., 1897.

J NO. M. REYNOLDS,

[sEAL.]

Assistant Secretary of the Interior.

Counter-signed:

.JoHN S. SEYMOUR,

Commissioner of Patents. 

